OS1.3 - Optical Ozone Sensing by Composite Films of Noble Metals and CdSe/ZnS Quantum Dots
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
- Optical Sensors 1
- M. Ando - Biomedical Research Institute, National Institute of Advanced Science and Technology (AIST), Osaka (Japan), V. Biju - Research Institute for Electronic Science, Hokkaido University, Hokkaido (Japan), H. Kawasaki - Faculty of Chemistry, Materials and Bioengineering, Kansai University, Osaka (Japan), Y. Shigeri - Health Research Institute, National Institute of Advanced Science and Technology (AIST), Kagawa (Japan)
- 91 - 92
The photoluminescence-based ozone sensitivity of composite films composed of noble metal particles and CdSe/ZnS core-shell quantum dot is investigated. The composite films are prepared by the sputter-deposition of Pt, Au, Pt-Pd alloy or Ag particles onto a glass plate substrate, which is followed by deposition of quantum dots from an organic solution. For comparison, a quantum dot film without any noble metal is prepared. In air, the Pt- , Au- and Pt-Pd alloy-based composite films, and quantum dot-only film emit bright photoluminescence, whereas emission from Ag-based composite film is weak. The composite films and quantum dot-only film show reversible changes in photoluminescence intensity in presence of ozone at the ppm level in air at room temperature. Optical ozone sensitivity, i.e., ozone-induced changes in photoluminescence intensity of quantum dot, are affected by the noble metal particles in the film. When compared with a quantum dot-only film, a composite film composed of Pt or Au shows higher ozone sensitivity by 43% or 27%, respectively. In contrast, the sensitivity of a composite film composed of Pt-Pd alloy particles is lower than that of a quantum dot-only film by 32%. However, the alloy- and Au-based films show quicker recovery of photoluminescence, which is after removal of ozone in the surrounding atmosphere, when compared with quantum dot-only and Ptbased film. These results show a possibility to enhance the optical ozone sensitivity and response/recovery rate of quantum dots by the addition of noble metal particles.